So I'm a little disappointed, was at least hoping for a fairly infected computer to see what Avast/Sophos detect and what MalwareBytes removes. MalwareBytes for Mac is not the Mac version of MalwareBytes for Windows. This is a 'Back covering' message from Avast in case there are any interactions causing crashes etc. If you install Malwarebytes 1st and try to install Avast it will display a message stating that 'Multiple AV/AM packages are installed and Avast recommend the removal of any other software'. You should have a reputable virus scanner with up to date definitions and a good Malware scanner like Malwarebytes, both running real time protection. Yes, in fact, that's the way it SHOULD be done. To uninstall Malwarebytes for Mac, you can simply uninstall the program through the Mac's Help menu, or download and run our uninstall tool to remove every Malwarebytes program file and component.